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Reference period for core variables: constant, at selection, current situation, income reference period (12 months period), usual week, last 4 weeks, last 12 months, since last year, working life, childcare reference period (Eurostat (2010): DESCRIPTION OF TARGET VARIABLES: Cross-sectional and Longitudinal 2008 operation, p. 76). Similar to the previous surveys, three reference periods were used in the questionnaire: the reference period for most questions was 2006 to 2008, i.e. the three-year period from the beginning of 2006 to the end of 2008. The indicators on innovation expenditures were based on the calendar year 2008. Additionally, the turnover and employment of enterprises were requested for two years: 2006 and 2008. All countries collected the data in accordance with these reference periods. (Eurostat (2010): 2008 Final Quality Report CZ, p. 33.)
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